Blue Skies,Guanajuato, Mexico

Our clear skies on Earth are blue because the atoms and molecules in the planet's atmosphere scatter the blue part of sunlight the most, making it appear as if it is coming from all directions. The face of the Moon is visible too because of light from the Sun. As sunlight strikes the lunar surface, it is reflected, making this otherwise dark world visible from Earth. The phases of the Moon change throughout the month depending on how much of the lunar disk is illuminated by the Sun.